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The URL is https://www.facebook.com/username if he had a Facebook username or a username@facebook.com email address (replace username with his username), or https://www.facebook.com/profile.php?id=### otherwise (replace ### with his numeric user id). If you do not know his username or id, you may be able to find it in some old Facebook email notifications if you still have any in your archived mail. For example, about a week before his last birthday you may have received a notification from Facebook that his birthday was coming up. His name should be a blue link and if you hover over it the link should include id=### (among other things), where ### is his Facebook user id.

It is my understanding that Facebook will not delete the account of a deceased user unless specifically requested by a verified immediate family member. So if the account has been deleted then you may want to check with anyone else who may have requested this before contacting Facebook. I would imagine that Facebook would be reluctant to take any further action if there is evidence of a family dispute.